Use Platform::IsWayland from lib_base

Telegram/SourceFiles/core/application.cpp

@@ -22,6 +22,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "core/ui_integration.h"
 #include "chat_helpers/emoji_keywords.h"
 #include "storage/localstorage.h"
+#include "base/platform/base_platform_info.h"
 #include "platform/platform_specific.h"
 #include "mainwindow.h"
 #include "dialogs/dialogs_entry.h"
@@ -772,9 +773,13 @@ void Application::notifyFileDialogShown(bool shown) {
 }
 
 QWidget *Application::getModalParent() {
-	return QGuiApplication::platformName().startsWith(qsl("wayland"), Qt::CaseInsensitive)
+#ifdef Q_OS_LINUX
+	return Platform::IsWayland()
 		? App::wnd()
 		: nullptr;
+#endif // Q_OS_LINUX
+
+	return nullptr;
 }
 
 

Telegram/SourceFiles/platform/linux/linux_libs.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "platform/linux/linux_libs.h"
 
+#include "base/platform/base_platform_info.h"
 #include "platform/linux/linux_gdk_helper.h"
 #include "platform/linux/linux_desktop_environment.h"
 #include "platform/linux/specific_linux.h"
@@ -15,8 +16,6 @@ extern "C" {
 #include <X11/Xlib.h>
 }
 
-#include <QtGui/QGuiApplication>
-
 namespace Platform {
 namespace Libs {
 namespace {
@@ -144,8 +143,7 @@ bool setupGtkBase(QLibrary &lib_gtk) {
 		// Otherwise we get segfault in Ubuntu 17.04 in gtk_init_check() call.
 		// See https://github.com/telegramdesktop/tdesktop/issues/3176
 		// See https://github.com/telegramdesktop/tdesktop/issues/3162
-		if(QGuiApplication::platformName().startsWith(qsl("wayland"), Qt::CaseInsensitive)
-			&& !lib_gtk.fileName().contains("gtk-x11-2.0")) {
+		if(Platform::IsWayland() && !lib_gtk.fileName().contains("gtk-x11-2.0")) {
 			DEBUG_LOG(("Limit allowed GDK backends to wayland"));
 			gdk_set_allowed_backends("wayland");
 		} else {